Industrial Harmonic Mitigation Solutions

What Are Harmonic Mitigations?

Harmonics refer to distorted components in current or voltage whose frequencies are integer multiples of the fundamental frequency (typically 50 Hz or 60 Hz).
In modern industry, the widespread use of nonlinear loads such as variable frequency drives (VFDs), UPS systems, switching power supplies, and LED lighting is the primary cause of harmonic pollution.
When these nonlinear loads consume electrical energy, they distort the sine waveform and feed “dirty power” back into the grid.

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The Hidden Cost of Harmonic Mitigation Solution

Equipment Overheating

Harmonics (especially higher-order harmonics) cause the skin effect, resulting in significant additional heat loss in transformers, motors, and cables, which drastically shortens the service life of the equipment.

Equipment Damage

Harmonic voltages can cause sensitive electronic components to fail and are highly likely to induce parallel resonance with capacitive devices in the system, leading to capacitor bulging or even rupture.

Malfunction & Downtime

Distorted waveforms can interfere with zero-crossing detection in precision control equipment such as PLCs, sensors, and CNC machine tools, leading to false alarms, unintended tripping of protective devices, or frequent restarts.

Passive Filtering

Active Filters

Complete/Integrated Solutions

Passive Filtering

By combining a filtering reactor (CKSG) with a capacitor (YD-R), this system suppresses harmonics at specific frequencies and provides reactive power compensation.

Low Voltage Self-Healing Power Capacitor

Detuned Series Reactors for Capacitor Banks

Intelligent Reactive Power Compensation Controller

CJ19 Series Capacitor Switching Contactor

YD-TSCL Series Low Voltage Dynamic Switching Switch

YD-TSCL Low Voltage Dynamic Switch

YDFK Series Intelligent Composite Switch

YDFK Compound Switch for Capacitor Banks

Multifunction Power Meter for Energy and Power Quality Monitoring

Active Filters

It monitors in real time and actively generates reverse current to offset harmonics. Yide insists on using core control boards manufactured on its in-house SMT production lines to ensure the APF’s operational accuracy and stability in high-frequency environments.

APF - Active Power Filter

Complete/Integrated Solutions

We offer APF active power filter cabinets or an “APF+SVG” combination to achieve the dual objectives of harmonic mitigation and reactive power compensation at optimal cost.

SVG - Static Var Generator

APF - Active Power Filter

ASVGC Integrated Power Quality Management Device

All core modules undergo 24-hour full load/no-load cycle aging testing to ensure industrial grade stability under complex operating conditions.

Related Cases

High-Voltage SVG for PV Grid Integration in Dongneng Logistics and Jinxi Industrial Park

Dongneng Logistics and Jinxi Industrial Park deployed YIDEK’s high-voltage SVG to stabilize grid voltage and manage reactive power during surplus PV export. Read the full case study.

Zhouyi International Hotel Power Distribution Renovation Project

A five-star hotel in Wenzhou solved low power factor and three-phase imbalance issues with YD-868 intelligent capacitors. Read the case study to learn the results.

FAQ

What are the main sources of harmonic pollution?

Non-linear loads: variable frequency drives (VFDs), UPS, switch-mode power supplies (computers, servers), LED lighting, rectifiers, arc furnaces, etc. They inject distorted currents at integer multiples of the fundamental frequency.

What specific damages do harmonics cause?

① overheating of transformers, motors, cables (skin effect); ② capacitor bulging or explosion (overcurrent due to harmonic amplification); ③ nuisance tripping, PLC/sensor malfunctions; ④ neutral overload (triplen harmonics accumulation).

What is the difference between APF and passive filtering (reactors + capacitors)?

Passive filters target only specific harmonics and may cause resonance with the system. APF simultaneously filters 2nd-50th harmonics with real-time dynamic response and zero resonance risk. APF is recommended for complex or variable harmonic sources.

How to determine the required APF capacity?

Measure total harmonic distortion (THDi) and individual harmonic currents. The APF rated current should generally be at least 1.2 times the maximum harmonic current. Professional 72-hour monitoring is recommended, or contact Yidek for a free initial assessment.

Can APF completely eliminate harmonics?

APF can reduce total harmonic distortion to below 5%, meeting international standards like IEEE-519. Absolute zero is not achievable. For extreme cases, multiple APFs or a combination with passive filters can achieve higher mitigation.

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